Topazs Rigid Aluminum Couplings feature a tubular threaded type assembly and ensure proper alignment and a secure connection when joining two ends of threaded Rigid conduit. Other applications include bonding threaded conduits to electrical junction boxes or enclosures when used in conjunction with chase nipples and connectors. Constructed of lightweight 6063 aluminum alloy for easy handling and high corrosion resistance. Available in 1/2" to 4" sizes with NPSM threads. UL listed.